swordfish, Xiphias gladius - large toothless marine food fish with a long swordlike upper jaw; not completely cold-blooded i.e. they are able to warm their brains and eyes: worldwide in warm waters but feed on cold ocean floor coming to surface at night --2is a kind ofscombroid, scombroid fish --2is a member of Xiphias, genus Xiphias --2has parts: swordfish